Have you ever read this extremely nihilistic book?
"The Dark Side: Thoughts on the futility of life from the Ancient Greeks to the present" By Alan R. Pratt.
It's filled with over 1,000 quotes from hundreds of people who held nihilistic views. It's the bleakest book I've ever read leaving no hope for mankind or anything at all. I can only read a few pages a day because it's just that bleak and depressing.
If your interested in the book, you can find it on Amazon. I got it used for 15 bucks. Otherwise it's like 100 dollars for a new copy.